There are a few reasons why your PS4’s upload speed could be slow. One reason is that your PS4 is using its own network, which may be slower than the one your computer uses. Additionally, your PS4 may be using up some of its storage space to hold all of the files that are being uploaded, which can cause it to slow down. Finally, if you have a lot of files that are being uploaded at once, you might experience some delays between each file.
